Optometrists Guide To Progressive Lenses-shdoclc.dll

Small Business Progressive lenses are the lens manufacturers answer to the demand for less subtle and more fashionable multi-focal lenses. Not only are they more preferred by the people, but they actually provide a more natural correction of presbyopia. Its forerunners, the bifocal and trifocal lenses, offer the same service as the progressive lens. Unlike the forerunners, users do not experience image jumps when switching from one lens to another when using progressive lenses. In other words, they provide a more seamless progression from long, intermediate and short range lenses leading to a more .fortable experience. In addition, the progressive lens offers a more fashionable look for those people who dont want to admit that they need reading glasses. The lenses .e in a variety of materials like regular plastic and or glass, polycarbonate, high index and photo chromic. They can also be customized specifically for each users preference. The differences in lens design are the length and width of progressive power corridors and how much would be devoted to the different viewing distances. Basic types of lens There are two basic types the soft design and the hard/short corridor design. The soft design is suitable for frames measuring at least 27 mm, top to bottom. It offers a wider and longer field of viewing intermediate range distances, and a more natural vision since the soft focus areas are subtle and less noticeable. The hard/short corridor lens is specifically made for presbyopes who need exceedingly little intermediate range lenses. The clarity for long and short range lenses are enhanced slightly .pared to the soft design, but the soft focus areas are much larger and more pronounced. These lenses are also made for slimmer and smaller frames. Lenses according to function/use Aside from the previously mentioned types, there are two other kinds of progressive lenses: office lenses and premium lenses. Office lenses, or .puter lenses, have a wider corridor for intermediate range. These are for people who work in front of .puters at least 4 hours every day, or spend a lot of work using intermediate range vision (hairdressing, carpentry, etc.). Premium lenses, or free form design, are created with wave front technology and are 100% digitally surfaced or ground. These lenses are perfectly customized and are the most expensive lenses. Possible problems Since this is relatively new technology, these lenses are not problem-proof. Below is a list of possible problems or difficulties encountered with progressive lenses: Inaccurate placing of the optical centre of the lens Wrong type of progressive lens design is given Patients’ not understanding how progressive lenses work Patients having hyperopia, making the adaptation period to the lenses longer than usual Frame adjustments that sever the short range lenses too far, or frames that were not taken into consideration when creating or picking the lenses As technology progresses, less and less problems are encountered by manufacturers and users. With the popularity of progressive lenses increasing, more developments and more customized lenses might soon be available for every persons exact aesthetic or vision-correction need. About the Author: 相关的主题文章：